I’m always amazed at how old tutorial videos explaining things so well and in such a simple, elegant way.

I love these classic old American explanatory videos, military training videos etc. They're so clear and to-the-point, and always in that Transatlantic accent that you just don't hear anymore.

Old school physicists are good at breaking things down to layman.

It doesn't matter if the video is old and classic, but the explanation is magical and made me understand a complete book. Thank you!

One of the nice things about tubes is being able to actually see the elements being discussed which makes it, in my mind, easier to understand. If I had my way, tubes would still be taught to help visualize what happens in an amplifier, even in solid state.

These videos are about as clear as it can get. Why do modern educational vids lack this.

These older films (transferred to video) were very well made. The explanation of how vacuum tubes work is interesting. I am in my 70s, and in my early years of working in electronics I was building projects and doing servicing of devices using vacuum tubes. The tubes in this video are of a much older generation of the ones I worked with.

Although this is many decades old, the technology described by the narrator is surprisingly advanced. It makes me appreciate old technology even more.

Please post more videos like these. Real quality instruction! Makes learning enjoyable. Absolutely clear cut content.

Thank you for this - it genuinely very useful for music tech classes. We talk about valve amps all the time without (in many cases) really understanding what they actually are.

VTs explained in an elegant, simple manner. Thumbs up!

Thanks vacuum tube inventor for paving the way for the transistor.

Beautiful, clear, crisp explanation!!

For the first time I understand the concept. Thank you!!

I've held a General Radiotelephone Operator's License' "GROL", since before the days of the 'Supersede Order' for the "Second Class Radiotelephone Operator's License". This video is leaps and bounds above all the rest regarding "Tube Theory"!!

Thanks Rob . Your information is always great

Thank you very much, Rob. BTW: I received the StewMac 5e3 15 watt amp kit, but i have a couple of weeks DIY work to be done before we can move into the older (but new-to-us) house we purchased. As I am writing this, it occurs to me that I had better check on the StewMac warranty for the amp and parts almost immediately. Nevertheless thanks again for the video here!

Hi Rob, your website is very impressive and resourceful. Using clue from there i changed AC heater to elevated AC configuration.

this brings back some memory cells. worked on vacuum tube radio transmitters while in the air force 50 years ago.

What a gem! I really enjoyed the video.

They explained it so well that now I can understand the usees of the transister.

I always wondered how a tube amplifier works, and now I understand. Thanks Rob, you provide a wealth of knowledge!

This video is amazing. It's all so simple.

Best explanation I ever saw thanks for sharing..

Awesome! Thanks for the upload! Wish professors these days could break down transistor op-amps in a simple way like this

makes me happy to see that 237,000+ people have chosen to watch this. :)

Wonderful explanation.

A good original video improved with your efforts. Thanks!

Wow, I just found out you have a KZfaq. I have to thank you from the bottom of my heart for all the time you took on your website to explain the AB763 circuit. I went from not knowing a single thing about amp circuits to doing my own repairs on a fender drri during the pandemic because of your page. I even managed to re cap it. You do such a good job of explaining it to a lay person. Thanks again, and a side note I enjoyed the story about the military training plane that was a shit design/catastrophe waiting to happen

Such an awesome Comprehensive video !! Hats off ... use of cartoon for the flow was really worth for easy understanding, Thank you so much :)

Thanks Rob, love ur stuff pal!

Love the modern graphics.

Beautiful.

Thanks for the information

Magnífica animación! Gracias por compartir.

Very clear explained

Great explanation!

Thank you, Rob.

I am very thankful to you

Hey Rob, Glad to see you have a channel here old friend.

Fantastic!

Amazing explanation

This is the best video on youtube

Thank you for sharing, and for pointing out that the full video is available. Vacuum tubes were still quite common when I was a kid, and I grew up through what I consider "The Digital Revolution" through the late seventies going through the eighties. I witnessed the demise of the LP, 8 track, reel to reel, slide projectors, and film projectors. I witnessed the development and demise of audio cassettes, VHS, and Betamax. I saw the rise and fall of CDs and the development of the dvd. I witnessed the war between Bluray vs HDDVD just like vhs and betamax. If seen the development of mp3, mp4, and streaming. I've seen numerous game systems from Atari 2600 and 5200, through NES, Wii, to XBox and PlayStation and their various associated handheld units. I remember when a 19 inch color tv tipped the scale at around 75# and was state of the art. Now we have displays that cover a wall weighing around 150# at barely 1-2 inches thick, and can project an image anywhere with no wires or cords from a projector the size of a deck of average playing cards. Personal computers were only for the rich, and only doctors, lawyers, and the occasional drug dealer had a mobile phone that was the size of a briefcase. Today, we wear and carry devices as phones that are far more powerful than all of the combined computing power of every computer NASA had when we sent astronauts to the moon. My first computer in 1998 was cutting edge technology with a 300 MHz processor, 4MB video card, 64MB ram, a 4.3 GB hard drive, and a 56K modem with 24K fax. It can't even come close to what my two year old Note 8 does. We also went from wired Ethernet which we still use, to extensive wireless home networks through 802.11 a, b, g, and n. Mobile phones are small and inexpensive enough that everyone has one in their pocket and they went through wireless technologies from Edge through G, 2G and 3G, 4G and 4G LTE and now into 5G. That doesn't even count the IOT or internet in general as we know it. All of this is only the tip of the iceberg. But now we're bringing back tube amplifiers, LP's, and the instamatic camera and now have instamatic photo "printers" that connect to our smart phones and "print" a photo that comes out entirely white and becomes a photo before your eyes, and call the technology "new." At best, it's old school with a modern twist. I'll be 47 in 2020, and as fast as technology changed then, it's nearly lightning quick today. We really do have the world at our finger tips.

great video

I knew a Mr. Robinette, he was a great and intelligent Man and great teacher!

Great! Amaizing! Love This!! Remas in me Childhood, last 40 years.. I colect the tubes like some tresure.. now good to lesrn al this

Crystal clear

Thanks Rob Robinette

So it's basically a transistor but with different physics

It is unreal how the tube amplifier analogy is so much easier to understand than with transistors.

great work! tnx

Well done.

Old is gold....

Short and sweet

Wow its amazing to see how vac tube used to work.

It was interesting and I got my answer. Thankyou.

How does someone even invent this stuff...amazing !!!

Great Vid, I like IT !!!

This is so well explained even tarzan would understand it

Thank you!!!

Thank you.

This is what makes America so great, these instructional videos are clear, articulate and very instructional. Much better than many KZfaq videos today.

Thanks for taking the time to translate

Still used in high power radio and TV transmitters, although they are in ceramic tubes, not glass ones.

very helpful

Thank you Sir for your immense work and great heart to share your knowledge !.......Appreciate !......Greetings from Quebec !

It might be old but it does the job. I now know how it works

I’ll have to watch this, again.

thank you.

Some things they got right a long time ago.

thank you

Nice video

thanks was helpful...!!!

Even though the video is old. Their explainations are still better than modern videos.

When i was 10 years old, last.. 40 years, my trsurs were to colect those Tubs. I was so intersting, watcis all wires, grids use? I watced hours by hours. When we open our Blcj whote T.v I was so quries wat is all this elctronics part. This clip realy wonderful.

Nice

Good day Mr Rob .....I'm new to your amplifier site and couldn't find any contact infos so decided to leave a message here ............How can we thank you enough for all the infos you have on your site ,......this is MASSIVE work !!!..........don't know how you found the time to do this but Thank you SIR !!!.......................Lou

More please.

Totally tubular!

And, thats how the Korg Volca nubass works ;-)

Hey buddy... fancy seeing you on youtube instead of facebook lol

Super intéressant 😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊

Great! To the point! Thank you! Now the internet should delete every other useless video out there.

I could've used this guy in my earth sciences class

You wouldn't happen to have the full 28-minute film available, would you?

good

Vintage physics 💜

wow! 😂 i need these tutorials, all episodes! please help, where can i find it?

I love this vintage demo! Why all the thumbs down? Too difficult to comprehend? 😏☹️🤣

Great video/edit. Do you have a link to the original?

I always wondered what all those huge Vacuum Tubes inside my PC did.It all makes sense now.

Wait, so is the signal input clamping the Waveform output up? Makes sense if we decouple the DC shift. Then it would work like a bjt amplifier. Can anyone with tube experience confirm? It almost seems too easy

Just ignore the text being placed over the video. It's making things more confusing.

If you want to actually see a Thyratron power supply in operation (That's three tubes, two of them are mercury vapor Thyratrons, third is a neon), take a peek at this. kzfaq.info/get/bejne/jb5nZ6qgrdvbeJ8.html It's a high power 200V .5A DC supply for a Teletype model 19.

Very nice from 🇧🇩🇧🇩🇧🇩🇧🇩🇧🇩🇧🇩

Found It ! Found It !!!! Now I can do a basic computer :D (Hello from 1940's)

thanks for the video. why id you cut it 2:33 what were the other 4 of 6 basic things

Does the heating element take time to heat and start closing the circuit? Because the transistor can swich on and off very fat. Does the vacuum tube swich on and off fast too❓️

Can the vaccuum tube hold free electrons? Basically what I'm saying is: If you used an electron gun to fire electrons into the vaccuum tube and held them there with a momentary magnetic field, would the electrons stay in the vaccuum if it were completely insulated and you turned off the magnetic field? Keep in mind, there's no anode attracting the electrons, only the magnetic field confining them in the space till it(the magnetic field) is turned off. If not, where do the electrons go if the vaccuum is insulated, therefore they can't be absorbed by the vaccuum itself? Wouldn't that mean they'd have to stay in the vaccuum indefinitely until the tube is connected to an anode, or other positively charged objects?